Strainer valve for filters



H-. n. ELFRUH. STRAINER VALVE FOR FILTERS. APPLICATION FILED JAN-28,19l9.

1,409,337. Pammlum.14,1922,`

l l' 31 I' HAROLD D.'11I,IsIn'rrII, ois'y PIIIIarDELrIIIA,` rnNNsYLvANIa.AssIGNoRg-'DY AssIGNMENTs,:To ugs-B.. w.eocIIItA1vE CORPORATION, or PHILADELPHIA, PENN-f Y SYLVAN'IA, A CORPORATION'OIEPENNSYLVANIA.

x `sirmnvna. fvALvE non rIL'rnns.

. Specification of Letters Patenti 'I Application .filed January 28,1919',,Seriali1\To."2'73,54=6.k

To all whom t may concern.'

Be .it known that I, HAROLD DJELFRETH,

a citizen of the United States, residing in the city and county of Philadelphia, State of Pennsylvania, have invented new and useful Strainer Valves for"Filters,of which the following is a specification.

My invention consists of a strainer valve for a filter embodying a body anda top plate or cover therefor having between them an orifice or port which permits the flow of the water to be filtered into said body, said top plate being provided with means for positioning and retaining it on said body, avoiding the use of screws therefor, and adapting said orifice or port to .be enlarged automatically by outfiowing water when the filter is being washed to cause sand or other matters that may have lodged in said orifice or port to be removed therefrom.`

The invention is satisfactorily illustrated in the accompanying drawing, but the important instrumentalities thereof may be varied, and so it is to be understood that the invention is not-limited to the specific details shown and described.

Figure l represents a vertical section of a strainer valve embodying my invention.

Figure 2 represents a bottom plan view of the top plate of the device.

`Figure 3 represents a section of a member'of the top plate detached, on line 3*-3 Fio'ure 2.

imilar numerals of reference indicatey the inner side ofthe upper portion of said body so as to properly locate said plate on said body, prevent displacement of said plate, and uide the latter in its vertical movements, It being noticed that the bottom of said plate is raised from the top of said body as to form the kport or annular orifice 4 between said body and plate for the admission of water into the former from a filter bed infthe directionV of the 'leftfha'nd arrows inFigure l. l

In order" to retain the plate 'praised from Patented;-

the body' and prevent saidorific'e orfport outwardly vlaterally projecting fianges 5 vwhich are adapted to restron the top edge side of the upper portion'thereof, the de-k scent of the plate being as is evident limited by said flanges abutting the top edge of the body as stated, the positioning of the plate thus being adjusted and the orice or port 4 preserved in its vopen condition.

Pendant from the centre of the underside of the plate 2 and secured thereto or formed,

therewith is thev ear or eye 6l which enters the body 1 and has passed through it the transversely-extending pin or rod 7 whose ends are secured to the side wall of the body f l, the diameter of the opening 8 of said eye being somewhat greater than that of the diameter or thickness ofthe pin 7 so that said opening has a clearance to permit the eye and consequently the top plate to rise to an extent limited by said pin without actual displacementof said top plate.

By this provision the port or orifice 4 may be enlarged in vertical direction, so that when the 'filter is being. washed and water enters the body in reversed direction, that is, in thedirectionof the right hand ar-V rows, it raises the top plate and the water;

flows out through theenlarged -orifice or port releasing and taking with it any sand or other foreign matters that may have v lodged in said orifice or port and directing the water with said matters through and from the device. s

When the outward flow of the water ceases, the topplate lowers to its adjusted Y position restoring'the orifice or port in nor- Y mal condition.

It will be seenV that by the present con-L struction of the members of the device, the

objectionable screws heretofore used to guide and connect the top plate are dispensed with'.

so i

Having thus described my invention what I'claimas new and desire to secure byV Letters Patent, is

l. In a strainer for a filter, a body, a lid therefor, said lid and body being adapted to have between thema port, an ear depending from the interior of said lid and atrans-V versely extending pin in said body connected with the side thereof and passing through an opening in said ear, said opening being of considerably `greater diameter in'l verticalv direction than that of said pin,pwhere by said ear is adapted to have a verticalplay on said pin, thereby permitting the bodily ascent of said lid to cause the latter to Yopenl automatically said port to a greater extent than normally. y v

2. In a strainer for a lter, a body, a lid therefor, a guiding lug dependingfrom the interior of said lid adjacent to the inner wall of said body, saidk lug 'being 'formed with a flange which is adapted to be seated on thetop of said body providing ports between said lid' and body, anear depending from the interiorfof saidflidY and having an opening in .it',;andY va transversely extending 

